Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a15b54f9637cbd…

MALICIOUS

PDF

81.5 KB Created: 2021-09-15 03:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c1155bbdd480426347d678cbc8492749 SHA-1: 5ce1e4de2edca75d20ceda8eb7c6839a49c8a205 SHA-256: f2a15b54f9637cbd7f239cf52a1007f252848eab512fa0e5059e5f9e79345ea4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c276234994---juzuwemorodunanagod.pdf In PDF document text
    • https://cauthinh.com/luutru/files/51848387215.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/9bed94950ec95ad05e2f01bc66dae265/bixupesetodibodakisi.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/82467319712.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/52992783009.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/35145607613.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/33505359960.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/24177576565.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/rukuzemiteguri.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/beff6da774c08d152c082bb5a466270e/juwumorokakoluxujamezina.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/sagemiviruje.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbd960b2a0---85572667816.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/15111342213.pdfIn PDF document text
    • http://devison-matras.com/upload/file/89884063146.pdfIn PDF document text
    • http://sushi-belovo.ru/files/33944711491.pdfIn PDF document text
    • http://schokofontaenen.de/idata/lopamo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc13ae7b9a---zagugafategalenibegavas.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/38560007307.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/pukipad.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/39295187751.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/8734933832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=watch+hollywood+movies+online+for+free+full+movie+with+english+subtitlesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8C 17916 bytes
SHA-256: 4bd554243d1b7b60265a5243b0087b87156b722b8aba247e40338812b2addab5
font_02_sfnt_off00011b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2F 11420 bytes
SHA-256: 446672cb9c60dad6ca9d0fe04d28edef2b921d2f91b8aee18d4b28003a71a82f

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